malloc分配内存不匹配，无法输出超过3个字节的字符串

Question

#pragma once
#include<stdio.h>
#include<string.h>
typedef struct _hero
{
	int id;
	char * name;	
}hero;
void inputhero();


#include<stdio.h>
#include<string.h>
#include"hero.h"
void inputhero()
{
	int i;	
	for (i = 0;i < 1;i++)
	{
		printf("请输入第%d位英雄的信息：\n",i+1);
		heros[i].id = i + 1;
		printf("名称：");
		heros[i].name = (char*)malloc(20);
		scanf_s("%s", heros[i].name, sizeof(heros[i].name));
		printf("名称：%s\n", heros[i].name);
     }

Answer 1

.c少了一段hero heros[5];和最后的大括号